Improvement in hot-air furnaces



H. L. PALMER.

" Hot-A ir Furnaces;

Patented Feb. 1.1, 1873.

\N'VENTOR.

a I s E N H AM. PHOTZHITHOGRAPHIC ca Mx(assnmsls mums) PATENT OFFICE.

HENRY L. PALMER, OF NEW YORK, N. Y.

IMPROVEMENT IN HOT- AIR FURNACES.

Specification forming part of Letters Patent NO- 135,838, dated February 11, 1873.

To all whom it may concern:

Be-it known that I, HENRY L. PALMER, of the city, county, and State of New York, have invented certain Improvements in Hot 1 Air Furnaces, of which the following is a specification:

My invention relates to hot-air furnaces constructed with a series of fines or tubes surrounding the upper part or heating-chamber,

above the fire-pot; and it consists in forming the same by the regular junction of two corrugated sheets or castings, or by the application of an uncorrugated sheet or casting to a corrugated one, in such a manner that flue-spaces shall be constituted or formed for the passage of the air being heated. v

Figure 1 is a perspective view of a hot-air furnace embodying my invention.

Both forms of flues are shown in the same drawing, viz: Those made by the junction of two corrugations, and those formed by the junction of one corrugation and one plain surface.

A is the fire-pot; B, the ash-pit; and O is the base of the furnace, all of which parts may be made in the usual manner. The top or dome of myheater is scalloped on its edges to correspond with the corrugated part of the radiator below, as shown at t t iin the accompanying drawing. The radiator M of the heating-chamber is corrugated, and rests upon or is attached to a similarly scalloped ring at the bottom. The radiator M-is surrounded with a jacket or envelope, K, corrugated like the radiator M, as to, size and form, and theprojecting or approximate bends thereof are intended to meet those of the radiator M in such a manner as to form perpendicular flues side next the fire; but I prefer the other method. When made plain, as shown at m m, aseother sheet-iron. Brick-work may be substituted therefor in the usual manner. The top of the outer casing D is furnished with a conical or other suitable cover, out of which are openings with collars G, for the attachment of hot-air pipes, to conduct the heated air to any part of the building desired. Cold air is admitted through openings b bin the base of the heater, or in any of the well-known and usual ways. The arrows at a and (I d show the course of. the aircurrents It will be seen from the above that, by the employment of the jacketK surrounding a corrugatedheating-chamber, as herein shown, a series of heating-fines will be formed, into which no. gases or smoke from the combustion-chamber can pass, also, that they can be more easily made as shown, than when made separately of tubes in the usual manner. 7 Said jacket K may, if desired, have an outer corrugated body or jacket placed in the same relation to it as it occupies with reference to the radiator K and this may be continued or repeated as many times as necessary to get the whole benefit of radiation from the interior.

I claim as my invention Inner and outer corrugated plates, arranged in juxtaposition in a hot-air heater, so as to form heatingfiues in one or more sets.

' HENRY L. PALMER.

Witnesses:

JAMES A. SKIL'roN, WM. H. BUTTERWORTH. 

